Ameren Corporation reported on September 18, 2026, that it has completed the sale of $900 million in principal amount of Junior Subordinated Notes due 2057. The offering was conducted pursuant to a Registration Statement on Form S-3 (File No. 333-297949), which became effective on August 4, 2026. The transaction was further supported by a Prospectus Supplement dated September 8, 2026, to a Prospectus dated August 4, 2026.

The company disclosed that it received net offering proceeds of $891.0 million, before expenses, upon the closing of the transaction. The filing details the legal agreements associated with the issuance, including an Indenture dated September 1, 2026, between Ameren and The Bank of New York Mellon Trust Company, N.A., acting as trustee. Additionally, the filing includes an Underwriting Agreement dated September 8, 2026, naming Barclays Capital Inc., BofA Securities, Inc., J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC, MUFG Securities Americas Inc., and Truist Securities Inc. as representatives of the underwriters.